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raphlinus's profile
Raph Levien
Raph Levien
Raph Levien
@raphlinus

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Raph Levien

@raphlinus

Rust. Fonts. Graphics. Quaker. Independent. he/him

Berkeley, CA
levien.com
Joined May 2009

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    1. tanh(mmalex)  🦄‏ @mmalex 16 Oct 2019
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      • Report NetzDG Violation

      twitter DSP nerd communal bugfix help time: in dreams I have a rare, content-specific bug where a biquad filter in an EQ explodes. I'm enforcing my coeffs are nicely stable, eg see https://dsp.stackexchange.com/questions/24293/ensure-stability-against-coefficient-quantization … - but still it explodes. its bandaid time! should I:

      5 replies 2 retweets 6 likes
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    2. tanh(mmalex)  🦄‏ @mmalex 16 Oct 2019
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      (its entirely possible the filter is having its Fc/Q/gain being swept, which I implement as linear interpolation of biquad parameters - but I enforce that the post-interpolation coeffs stay inside the stability triangle in the z plane)

      3 replies 0 retweets 1 like
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      Raph Levien‏ @raphlinus 16 Oct 2019
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      Replying to @mmalex

      Consider a state variable representation rather than a traditional canonical biquad form. It's more stable and also faster on modern hardware.

      7:20 AM - 16 Oct 2019
      • 3 Likes
      • b̳̩͢ ̬̩͍̼̫̙o͚ ̮̮͖g҉̜̱͓̬̫ ͓̫g ̗̣̠̙͚͝g o̢̳̘͍ ̨̺̠͈ Shawn Walker-Salas tanh(mmalex) 🦄
      1 reply 0 retweets 3 likes
        1. New conversation
        2. tanh(mmalex)  🦄‏ @mmalex 16 Oct 2019
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          Replying to @raphlinus

          thanks! yeah I've been teetering on the brink of moving so SVF, but haven't been able to do the derivation for the various shelf/etc shapes I wanted, because I suck at filter maths :) will revisit

          1 reply 0 retweets 1 like
        3. Raph Levien‏ @raphlinus 16 Oct 2019
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          Replying to @mmalex

          See https://github.com/google/music-synthesizer-for-android/tree/master/lab … for my work on this a few years ago. Enjoy!

          0 replies 0 retweets 2 likes
        4. End of conversation

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